<template>
    <div>
      <!-- 面包屑组件-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>商品管理</el-breadcrumb-item>
        <el-breadcrumb-item>参数列表</el-breadcrumb-item>
      </el-breadcrumb>
    <!--卡片视图区域 -->
      <el-card>
        <!--头部提示区域 -->
        <el-alert
          title="注意：只允许为第三级分类设置相关参数"
          type="warning"
        :closable = "false"
        show-icon>
        </el-alert>
        <!--选择商品分类区域 -->
        <el-row class="cat_opt">
          <el-col>
            <span>选择商品分类：</span>
            <!--级联选择框 -->
            <el-cascader
              v-model="selectedCateKeys"
              :options="catelist"
              :props="{ expandTrigger: 'hover', value: 'cat_id', label: 'cat_name', children: 'children'}"
              @change="handleChange"></el-cascader>
          </el-col>
        </el-row>

        <!--tab页签区域 -->
        <el-tabs v-model="activeName" @tab-click="handleTabClick">
          <!--添加动态参数的面板 -->
          <el-tab-pane label="动态参数" name="many">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                       @click="addDialogVisible = true">添加参数</el-button>
            <!--动态参数表格 -->
            <el-table :data="manyDataTable" border stripe>
              <!--展开行 -->
              <el-table-column type="expand">
                <template slot-scope="scope">
                  <!--循环渲染tag标签 -->
                  <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
                          closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                  <!--输入的tag标签文本框 -->
                  <el-input
                    class="input-new-tag"
                      v-if="scope.row.inputVisible"
                    v-model="scope.row.inputValue"
                    ref="saveTagInput"
                    size="small"
                    @keyup.enter.native="handleInputConfirm(scope.row)"
                    @blur="handleInputConfirm(scope.row)"
                  >
                  </el-input>
                  <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                </template>
              </el-table-column>
              <!--索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="参数名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini"
                  @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="primary" icon="el-icon-delete" size="mini"
                             @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>

          <!--添加静态属性的面板 -->
          <el-tab-pane label="静态属性" name="only">
            <el-button type="primary" size="mini" :disabled="isBtnDisabled"
                       @click="addDialogVisible = true">添加属性</el-button>
            <!--静态属性表格 -->
            <el-table :data="onlyDataTable" border stripe>
              <!--展开行 -->
                <el-table-column type="expand">
                  <template slot-scope="scope">
                    <!--循环渲染tag标签 -->
                    <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i"
                            closable @close="handleClosed(i,scope.row)">{{item}}</el-tag>
                    <!--输入的tag标签文本框 -->
                    <el-input
                      class="input-new-tag"
                      v-if="scope.row.inputVisible"
                      v-model="scope.row.inputValue"
                      ref="saveTagInput"
                      size="small"
                      @keyup.enter.native="handleInputConfirm(scope.row)"
                      @blur="handleInputConfirm(scope.row)"
                    >
                    </el-input>
                    <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>

                  </template>
                </el-table-column>
              <!--索引列 -->
              <el-table-column type="index"></el-table-column>
              <el-table-column label="属性名称" prop="attr_name"></el-table-column>
              <el-table-column label="操作">
                <template slot-scope="scope">
                  <el-button type="primary" icon="el-icon-edit" size="mini"
                             @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                  <el-button type="primary" icon="el-icon-delete" size="mini"
                             @click="removeParams(scope.row.attr_id)">删除</el-button>
                </template>
              </el-table-column>
            </el-table>
          </el-tab-pane>
        </el-tabs>
      </el-card>
      <!--添加参数对话框 -->
      <el-dialog
        :title="'添加' + titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <!--添加参数的表单 -->
        <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="addForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="addDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
      </el-dialog>

      <!--编辑按钮的对话框 -->
      <el-dialog
        :title="'修改' + titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <!--添加参数的表单 -->
        <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
          <el-form-item :label="titleText" prop="attr_name">
            <el-input v-model="editForm.attr_name"></el-input>
          </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
    <el-button @click="editDialogVisible = false">取 消</el-button>
    <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
      </el-dialog>

    </div>

</template>

<script>
    export default {
        name: "Params",
      data() {
          return{
            //商品分类列表
            catelist: [],
            //级联选择框双向绑定到的数组
            selectedCateKeys: [],
            activeName: 'many',
            //动态参数数据
            manyDataTable: [],
            //静态属性数据
            onlyDataTable: [],
            addDialogVisible: false,
            addForm: {
              attr_name: ''
            },
            addFormRules: {
              attr_name: [{required: true, message: '请输入参数名称', trigger: 'blur'}]
            },

            editDialogVisible: false,
            editForm: {},
            editFormRules:{
              attr_name: [{required: true, message: '请输入参数名称', trigger: 'blur'}]
            },

            //控制按钮和文本框的切换显示
            //inputVisible: false,
            //inputValue: ''

          }

      },

      computed: {
          //如过按钮需要禁用，返回true，否则返回false
          isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3){
              return true
            }
            return false
          },
        //当前选中的三级分类的id
        cateId() {
            if(this.selectedCateKeys.length === 3){
              return this.selectedCateKeys[2]
            }
            return null
        },
        //动态计算标题的文本
        titleText() {
            if(this.activeName === 'many'){
              return '动态参数'
            }else{
              return  '静态属性'
            }
        }
      },

      created() {
          this.getCateList()

      },

      methods: {
          //获取所有商品列表
        async getCateList() {
          const {data: res} = await this.$http.get('categories')
          if(res.meta.status !== 200){
            return this.$message.error('获取商品列表失败！');
          }
          // console.log(this.cateList)
          this.catelist = res.data
        },
         handleChange() {
          this.getParamsData()
       },
        //tab页签点击事件的处理函数
        handleTabClick() {
          //console.log(this.activeName)
          this.getParamsData()
        },
        async getParamsData() {
          // console.log(this.selectedCateKeys)
          //证明选择的不是三级分类
          if(this.selectedCateKeys.length !== 3){
            this.selectedCateKeys = []
            this.manyDataTable = []
            this.onlyDataTable = []
            return
          }
          console.log(this.selectedCateKeys)
          //根据所选分类的id和当前所处的面板，获取对应的参数
          const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {params: {sel: this.activeName}})
          if(res.meta.status !== 200){
            this.$message.error('获取参数失败!')
          }
          //以逗号为分隔符分割字符串,三元表达式看是否为空
         res.data.forEach(item => { item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
           //控制文本框的显示和隐藏
           item.inputVisible = false
           //文本框中输入的值
             item.inputValue = ''})
          console.log(res.data)
          //判断获取的data是动态的还是静态的data
          if(this.activeName === 'many'){
            this.manyDataTable = res.data
          }else{
            this.onlyDataTable = res.data
          }
        },
        addDialogClosed() {
          this.$refs.addFormRef.resetFields()
        },
        addParams() {
          this.$refs.addFormRef.validate(async valid => {
            if(!valid) return
            const{data: res} = await  this.$http.post(`categories/${this.cateId}/attributes`,
              {attr_name: this.addForm.attr_name,attr_sel: this.activeName})
            if(res.meta.status !== 201){
              return this.$message.error('添加参数失败！')
            }
            this.$message.success('添加参数成功！')
            this.getParamsData()
            this.addDialogVisible = false

          })
        },
        //根据id查询参数函数
        async showEditDialog(attr_id) {
          const {data: res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,
            {params: {attr_sel: this.activeName}
          })
          if(res.meta.status !== 200){
            return this.$message.error('获取表单失败！')
          }
          console.log(res.data)
          this.editForm = res.data
          this.editDialogVisible = true
        },
        //重置修改的表单
        editDialogClosed() {
          this.$refs.editFormRef.resetFields()
        },
        //点击按钮，弹出对话框,完成修改
        async editParams() {
          this.$refs.editFormRef.validate(async valid => {
            if(!valid) return
            const{data: res} = await  this.$http.put(`categories/${this.cateId}/attributes/
            ${this.editForm.attr_id}`,
              {attr_name: this.editForm.attr_name, attr_sel: this.activeName})
            if(res.meta.status !== 200){
              return this.$message.error('修改参数失败！')
            }
            this.$message.success('修改参数成功！')


          })
        },
        //根据id删除组件
        async removeParams(attr_id) {
          const confirmResult = await this.$confirm('此操作将永久删除该角色, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
          }).catch(err => err)
          //如果用户确认删除 返回confirm
          //如果用户取消删除 返回cancle
          console.log(confirmResult)
          if(confirmResult !== 'confirm'){
            return this.$message.info("已取消删除！")
          }
          const {data: res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
          if(res.meta.status !== 200){
            return this.$message.error("删除参数失败！")
          }
          this.getParamsData()
          this.$message.success("删除参数成功！")
        },
        //文本框失去焦点或者摁下了enter键触发
        async handleInputConfirm(row){
          //console.log('ok');
          //判断输入的字符是否为空
          if(row.inputValue.trim().length === 0){
            row.inputValue = ''
            row.inputVisible = false
            return
          }
          //如果没有return，这证明输入了内容，需后续处理
          console.log(row.attr_vals)
          row.attr_vals.push(row.inputValue.trim())
          row.inputValue = ''
          row.inputVisible = false
          this.saveAttrVals(row)
        },
        //点击按钮展示文本输入框
        showInput(row) {
          row.inputVisible = true;
          //让文本框自动获取焦点
          this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
          });
        },
        //将对attr_vals的操作保存到数据库
        async saveAttrVals(row) {
          const {data: res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,
            {
              attr_name: row.attr_name,
              attr_sel: row.attr_sel,
              attr_vals: row.attr_vals.join(' ')
            })
          if(res.meta.status !== 200){
            this.$message.error('修改参数失败！')
          }
          this.$message.success('修改参数成功！')

        },
        //删除标签
        handleClosed(i,row) {
          row.attr_vals.splice(i,1)
          this.saveAttrVals(row)
        }
      }
    }
</script>

<style lang="less" scoped>
.cat_opt{
  margin: 15px 0;
}
  .el-tag{
    margin: 10px;
  }
  .input-new-tag{
    width: 120px;
  }
</style>
